Interlocking brake-shoe



E. L. MRDN.

NTERLOQKlNG BRAKE SHOE.

AEPLlcATloN FILED MAY5.1920.

` 1,382,785-, Panfewm 28, 19m,

UNITED STA'lEFl PATENT QFFICE.

ROBERT L. JORDAN, OF CHICAGO, ILLINOIS.

ElTERLOCKlNG BRAKE-SHOE.

To all whom t may concern Be it known that I, Bonnin: L. JORDAN, acitizen of the UnitedStates, residing at Chicago, in the county oi Cookand State of illinois, have invented certain new and usei'ulimprovements in Interlocking Braketihoes, ot which the following is aspecific; tion.

This invention` relates to improvements in railway brake shoes, `and hasreference more especially to that type of brake shoe which is adapted tohave attached to the tace or wearing portion thereof a back or rearportion of a partially worn brake shoe, so that such partially wornshoes, instead of being scrapped as at present, may be entirely used upby applying thenr to new brake shoes. rlhis type or' brake shoe iscommonly known as an interlocking shoe.

Various constructions of interlocking brake shoes designed to save mostoi' the waste or scrap of ordinary shoes and to effect an economy ofmetal have heretofore been proposed, but the chief objection hereftotore existing in shoes of this type has resided in the fact that thepartially worn shoe, when worn down very thin, breaks in two, andfragments thereof tall away, being liable to lodge in rogs or switchesand cause trouble, in addition to sometimes destroying the smoothwearing tace of the shoe structure which remains on the brake head.

Another objection, which has heretofore inhered in many interlockingshoes, resides in their unduly complicating structure, making themimpractical on the score of expensive cost ot production.

With these laults in view, l have devised the interlocking brake shoe orthe present invention, one object olE the latter being to provide aninterlocking shoe of such a construction that'the worn shoe may bepractically entirely used up, without leaving fragments or chips of anysubstantial size, such as might cause possible mischief from fallingonto the track. Another object is to provide an interlocking shoe havingmeans for attaching the worn shoe to the new shoe so securely as toprevent any danger cgt its becoming detached in service. This object isattained chiefly by the provision of a novel attaching or securing keywhich itself is locked in place by the same key which attaches the newShoe to the brake head. Still another object is to provide a brake shoeof great strength to resist breaking strains, this Specification ofLetters atent.

Patented June 28, 1.921.

ieee. serial No. 379,169.

object being attained by the use of a novel malleable metal insert.

@ther objects and advantages of the invention will be apparent to thoseskilled in the art from the Afollowing detailed description, when takenin connection with the accompanying drawing in which l have illustratedone practical embodiment of the novel structural features of theinvention, 'and in which Figure l is a central longitudinal section ot acomplete assembly comprising a brake head, a new shoe attached to thebrake head, and a partially worn shoe or slipper 'attached to thewearing iace oit the new shoe;

Fig. 2 is a bottom plan view of Fig. l, with the transverse locking keyomitted;

Fig. 3 is a vertical transverse section taken on the line 3-3 of Fig. l;

Fig. l is a transverse section taken on the staggered line lof Fig. 2;

Fig. 5 is a side elevation, partly in section, ot the malleable insert;and,

Fig. 6 is an elevation of the transverse locking key by which thewornshoe or slipper is secured to the tace of the new shoe.

Referring to the drawings, l0 designates the brake head which is of thewell known standard construction, and need not be particularlydescribed. l1 designates, yas an entirety, the' body of the shoe itselfwhich, in the preferred embodiment of the invention, includes amalleable iron insert which is shown in side elevation in Fig. 5 and ispreterably et the :full thickness of the shoe, the insert also havingtermed integral therewith the usual central attaching lug. Firstdescribing the malleable insert, the same coinprises a central bridgeplate 1 2 Yfrom which rises the central attaching lug 13 termed with theusual aperture 14 tor the passage oit the main fastening key l5 or thebrake head, and spiral, generally S-shaped, extensions 16 (Fig. 2)extending from the opposite ends of the bridge plate 12 toward the outerends of the shoe, and thin sti'l'liening strips 17 'and lS connecting`and bracing the inner and outer limbs ot the @shaped members in theregion closely adjacent to the back of the shoe.

Around this malleable insert is cast the gray iron body 29 having, ingeneral, the structural form of a standard shoe and provided at theopposite ends of its back with the usual concave guide lugs 20 for theforked ends of the brake head l0, and trans- V removed and then appliedto the face of a nid verse abutment lugs 2i for the ends of the brakehead. Centrally oi' rthe tace of the shoe, however, is a socket 22 intowhich lits the central attachment lug i3 of' the worn shoe. rlhe bottomwall of this socket, which is constituted by the central platel2 of theinsert, vis formed with a central transverse slot 23, and in registerltherewith is a transverse slot 24 formed through the central attachmentlug` 13. the slot 23 are shoulders 25.

At the opposite ends of the wearing tace of the shoe body are termedtransverse notches 26 to receive the transverse lugs 2 1 of a worn shoe,and also sockets 27 inwardly of the notches 2G to lit the guide lugs 20of the worn shoe; these interiittiiig lugs and sockets acting to resistendwise displacement or the worn shoe from the new' shoe under thefrictional drag ofthe worn shoe on the wheel.

28 designates, as an entirety, a locking key that extends through thetransverse slots 23 and 24 of the two internested shoes in the mannerclearly shown in Figs. land This key is provided with an aperture 29through which passes the brake head key l5, thereby locking it in place;and on the lower end of the key 28 are lateral ears or lugs 30 that abutsquarely against the shoulders 25 ot the worn shoe, in the manner mostclearly shown in Fig, 3, whereby the worn shoe is locked againstseparation from the new shoe so long as the lugs 80 remain effective;andsince the shoulders 25 `are in or above the pla-ne or' theback wallof the shoe, it follows thatthe body of the wornshoe will be completelyground off by the time its locking means has'been destroyed or rendereduseless. Hence, in the actual use of the device, the only chips thatresult are those representedby the guide lugs 26 and V27, which are sosmall as to represent negligible waste not likely to cause injury byYtalling to the track. V

ln the practical use of the invention, a new shoe vin first applied tothe brake head, and when the saine is worn down to one halt or one-thirdits original thickness, it 'is removed and applied to the face of a newshoe, the `two being then applied to the brake head, resulting in thecombinedinterlocking structure illustrated in Fig. l.A This struc-tureis then used until the worn shoe vhas been used up and the second newshoe has worn away to a point at which it is too thin for further usealone, whereupon it is third new shoe, and so on l am aware that it hasheretofore been proposed to attach a worn shoeto a new shoe by means ofcentral transverse key lugs on each ot' twoshoes which have a spring1locking engagement with each other. 'Suc i a connection, however, isuncertain and unf'it the opposite ends of worn away, and this one-piecekey can itself be locked in place by the ordinary brake head fasteningkey.

ll claiml. An interlockingbrake shoe, comprising a new shoe having acentral apertui'edattachment lug on its back for attachment to a brakehead, and a central socket in its face shaped to receive a like centralattachment lug or" a. worn shoe, a partially worn shoe fitted to theface of said new shoe, and a one-piece locking key passed through bothattachment lugs and secured by the brake head fastening key.

2. in interlocking brake shoe, comprising a new shoe having a centralapertured attachment lug on its back for attachment to abrake head, anda central socket in its face shaped to receive a like central attachmentlug of a worn shoe, both of said attachment lugs being transverselyslotted, and a one-piece locking key passed through the transverse slotsof said attachment lugs and having an aperture in registerwith theaperture of the outer attachment lug and adapted-to be entered by the,brake head tastening key. y

3. `An interlocking brake shoe, comprising a new shoe having a centralapertured attachment lug on its back for attachment to a. brake head,and a central socket in its tace shaped to receive a like centralattachnient lug of a worn shoe, said attachment lugs being transverselyslotted and formed with abutment'shoulders at opposite sides of thelower end of the slot, and a locking key passed through the transverseslots of said keeper lugs, said locking key having at itslower endabutment lugs engaged with said shoulders and having an aperture in itsupper end in register with the aperture of the outer keeper lug andadapted to be entered bythe brake head fastening key.

4. A brake shoe having a malleable insert extending throughout themajorportion' of the length otl the shoe, and said insert including a centralapertured attachment lugV on the back of the shoe.

5. A brake shoe having a malleableinsert con'iprising a central bridgeplate and curved extensions leading from the ends of said bridge platetoward the ends of the shoe, and a central apertured attachment lug onthe back of the shoe integral with said bridge plate.

6. ,ik brake shoe having a malleable insert comprising a central bridgeplate of less thickness than the slice body and disposed in the backregion of the latter, S-shaped extensions leading,` from the ends ofsaid bridge plate toward the ends of the shoe and ot the lnll thicknessof the latte-r, and a central apertnred attachment lug on the back otthe shoe integral with said bridge plate.

7. A brake shoe having a malleable insert comprising a central bridgeplate of less thickness than the shoe body and disposed in the backregion of the latter, fa-shaped extensions leading 'from the ends ofsaid .bridge plate toward the ends of the shoe and iof the fullthickness of the latter, stilfening strips connecting and bracing theinner and outer limbs of said S-shaped eX- tenslons in the regionadjacent to the back of the shoe, and a central apertured attachment lugon the back of the shoe integral with said bridge plate.

8. ln an interlocking brake shoe, a Shoe having a central aperturedattachment lug on its back for attachment to a brake head, and a centralsocket in its face shaped to receive a like central attachment lug of aWorn shoe, said attachment lng having a. transverse slot, in combinationwith a locking key engageable With said slot, said locking ke)T havinglateral lugs on its inner end for engagement with the Worn shoe, and anzpertnre at its outer end adapted to be entered by a brake headfastening key.

ROBERT L. JORDAN.

